Clock Wave allows you calibrate radio controlled watch or clock anytime and anywhere. Just click "Transmit" button, set your watch or clock to manual receive time signal, and place it nearby your iPhone/iPad's speaker, it will be calibrated in a few minutes.

Clock Wave features:
- Covers 5 major longwave time signal stations all over the world.
* Japan: JJY
* China: BPC
* DE: DCF77
- Automatically transmit the accurate time.

* If your radio controlled watch/clock doesn't support station BPC, select station JJY manually to use in China.
* If your radio controlled watch/clock doesn't support station MSF, select station DCF77 manually to use in UK.
* If your radio controlled watch/clock support only a specified timezone or station, (e.g. Using a radio controlled clock support only JJY station in Australia.), select the watch/clock timezone manually in app settings.

What’s New

Version 1.3.9

1. Optimized the UI.

Ratings and Reviews

4.9 out of 5
68 Ratings

68 Ratings

tatman1982 ,

Absolutely Works!!!

I downloaded this very skeptical!! Already expecting it not to work! Because it makes sense right how can a phone that can only transmit sound set a clock that receives radio signals! I don’t know how this works but it truly does! However you have to hold your clocks receiver close to the speaker on your phone with the volume all the way up! Then be patient it after you start a manual receive your signal reception will show very strong then just minutes later you will have a set clock! It’s really pretty amazing!!! The key to this working is keeping the clock your setting close to you phone while your transmitting!! Otherwise it won’t work!! You can’t believe those that say it doesn’t work because it really does!!

papachungo13 ,

Converted skeptic

I was doubtful of how clicking sounds from a speaker would simulate radio signals but bought the app anyway. I tried the app with a Lacrosse atomic clock that can’t receive a WWVB signal unless it was by a west facing window. It didn’t work so I was all set to give a 1 star scam rating and review.
I decided to try it again but this time I aligned the speaker with the back of the clock and turned up the iPad volume. When I looked five minutes later the signal received icon was showing on the clock and it was synchronized with the correct time, having been 12 seconds slow before.
Now I have to find how why and how this works

MAWilsonPE ,

How it works...

I have seen a lot of folks saying this cannot work. The app generates a sound signal but a radio controlled watch needs a radio signal to calibrate.

It is not the sound that is doing it but the electric square wave pulses in the wiring to the speaker that generate the electromagnetic pulses. There is a triple harmonic at 20kHz that generates the 60 kHz radio signal that your watch can recognize. If you plug a simple AM antenna into the speaker port of the phone it will work even better. (One wire to ground and one to left or right) Then all of the electrical energy goes to EM instead of wasting it to drive the speaker ;)


Zhen REN
3.3 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Simplified Chinese, Traditional Chinese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

You May Also Like